An implant does not relieve the patient of maintenance responsibility.
The implant in a suitable patient will almost certainly "last " 10 years often many more.
Fixed prostheses are attached to the remaining teeth if they are healthy or to dental implants if the patient has adequate bone for implant placement and is healthy. Attaching to teeth increases the risk of problem arising with those teeth somewhat. The best way to have a full set of teeth is to care for the ones nature gave you.
Removable prostheses (full dentures, partial dentures) are a useful method of replacing teeth and are generally less costly; they do not seal to the teeth like a dental crown and therefore allow food debris and plaque to accumulate between the denture and the teeth. This increases the risk of decay and periodontal disease affecting and damaging the teeth.
Removable prostheses are cheaper but more cumbersome; fixed prostheses are less intrusive but more expensive.
Both increase the patient's obligation for home care and regular professional care.